/Engine/Plugins/Editor/UVEditor/Source/UVEditorTools/Public/UVEditorUXSettings.h
The following are UV Editor specific style items that don't, strictly, matter to the SlateStyleSet, but seemed appropriate to place here. The ScaleFactor just scales the mesh up. Scaling the mesh up makes it easier to zoom in further into the display before getting issues with the camera near plane distance.
static const float UVMeshScalingFactor;